Photographic camera



Jan. 4, 1938.

NERWIN PHOTOGRAPHIC CAMERA Filed July so, 1956 4 Sheets-Sheet 1 JZZ/ZZZZOT. Ha fier Mervin PHOTOGRAPHI C CAMERA Filed July 30, 1936 4 Sheets-Sheet 2 .7 Qty Jan. 4, 1938. wm 2,104,094

PHOTOGRAPHIC CAMERA Filed July :50, 1 936 4 Sheets-Sheet s 4, W330 H, RW N PHOTOGRAPHIC CAMERA Filed July so, 1936 4 Sheets-Sheet 4 Patented Jan. 4,.1938

rno'roommo CAMERA Hubert Nerwin, Dresden-Blasewitz, Germany, assignor to Zeiss Ikon Aktiengeselllcliaft,

Dresden, Germany Application July 30, 1938, Serial No. 98,387 In Germany June 8, 1935 11 Claims.

The invention relates to improvements in photographic cameras and particularly pertains to miniature cameras of the roll film type.

Itis an'object oi the invention to improve the .5 readiness of the camera for taking pictures in.

rapid succession by arranging the operating member for tensioning the shutter and advancing the film strip at such a place that the operator need not remove the camera from its operative 10 position, for instance from in front of his eyes, in order to tension the shutter and advance the film strip for the next picture.

Another object of the invention is to provide for tensioning the shutter and actuating the film ad- T vancing means an annular operating member which is coaxially arranged with the lens system and is provided with an outwardly projecting extension adaptedto be manually actuated by the operator. This extension preferably terminates 99 in the neighborhood oi'the customary shutter release button, so that both of these members may be conveniently actuated in quick succession by the same hand, preferably the right hand, while this hand assisted by the left one holds the cam- 95 era. in operative position.

It is also an object of the invention to provide the camera with means which prevents an incomplete tensioning of the shutter and an incomplte advance of the film strip after a picture has 30 been taken. This means insures not only a complete tensioning of the shutter and simultaneously therewith a complete advance of the film strip for one step or picture but also makes it necessary that the annular operating member,

35 which tensions the shutter and actuates thefihn advancing means, has to be returned completely to its initial position before it again can be moved in the opposite direction.

A still further object of the invention is to 40 provide the camera with means for preventing a double exposure of a film section and to insure that the film section which has been moved into a position behind the lens for exposure is exposed before it can be advanced toward the takeup spool.

Other and further objects andnovel features of the invention will be apparent from the following detailed description thereof taken in connection with the accompanying drawings, in

50 which Fig. l is a front elevation view of the camera. 'Fig. 2 is a horizontal cross-sectional view of the camera, substantially on the broken line 11-- II of Fig. 3, with certain parts shown diagrammatically and in plan view respectively.

Fig. 3 is a verticalsectional view of the camera, substantially on the broken line III-III of Fig. 2, the film take up spool being shown in elevation.

Fig. 4 shows an enlarged scale in plan view a 5 portion of the spring influenced operating mechanism for advancing the film and tensioning the shutter.

Fig. 5 shows in an enlarged scale a sectional view of the shutter release button substantially on the line V-V oi Fig. 3.

Fig. 6 is a sectional view of a lever connection in the film advancing mechanism, substantially on the line V'I-VI of Fig. 3.

Fig. 7 is a vertical cross sectional view of the camera, substantially on the line VII-VII 01' Fig. 2.

Figs. 8, 9 and 10 illustrate diagrammatically the successive operating steps of the safety devicewhich is arranged between the film advancing and shutter tensioning means on one hand and the shutter release means on the other hand.

Fig. 11 shows in an enlargedscale an elevation view of the safety device and its association with the adjacent parts.

Fig. 12 is a plan view of the parts illustrated in Fig. 11.

Figs. 13 and 14 illustrate details of the device in different positions for preventing double exposure and non-exposure respectively, and

Fig. 15 illustrates a gearing for operating the film advancing roller and the film take-up spool.

According to the Figs. 1 to 3, the film advancing and shutter tensioning mechanism is arranged coaxially with the lens system and its ma- 301' operating part consists of an annular member 20 which is provided with an outwardly and upwardly projecting extension I terminating ad- Jacent the top wall of the camera in a. finger piece to which 'is adaptedrto'be engaged by a 40 fingeroi the'operator. .A lever 2 (Fig. 1) is provided 1dr setting the shutter to the desired speed.

This'lever is integrally connected with a rotatable annular member 3 which hasinscribed thereupon the available shutter speed. This annular member 3 is rotated by the lever 2 until the desired shutter speed indication is brought opposite a. stationary mark 4. In the immediate neighborhood of the finger piece ia there is arranged, in

the present instance in the top wall of the cam.- era casing, theshutter release button 5. The two light entrance openings of a mirror base distance meter are designated with 6 and 6', while the opening oia view finder is indicated at 6''.

Referring now to Fig. 2, it will be noted that to the camera casing consists of two separable sections 1 and 8 of which the latter forms a; rear cover adapted to permit access to the interior of the front section I for the insertion and removal of a roll. film. The front section I is provided at each end with a semi-cylindrical recess Ia and 1b respectively, for receiving the customary film supply spool I0 and film take-up spool I3 respectively. The film strip 9 is conducted from the supply spool I0 past the picturewindow II and over a film advancing roller I2 to the take-up spool I3. On the inner face of the rear section 8 is secured by means of a spring 15 a backing plate I4 which yieldingly presses the film fiat against the picture window II. The shutter device comprises a casing I6 on which'is attached the mechanism for tensioning the shutter and for operating the film advancing roller I2. The shutter segments are diagrammatically indicated at IT. This last named mechanism includes a bearing plate I8 secured to the shutter casing I6, and an annular bearing member I 9 which is positioned on the bearing plate l8. All these parts are arranged inside the front section I of the camera casing and are covered by the front wall 8|] of the casing, through which also extends a mounting sleeve 8| into which an exchangeable lens system 45 is adapted to be secured by means of a customary bayonet lock 46. The lens system 45 is focussed by rotating the ring 46.

The annular operating member 20 concentrically surrounds the mounting sleeve 8I and pro-' jects with its outer end, which carries the extension I, through a suitable opening in the front wall 80. The inner end of the annular operating member 29 is provided with a toothed segment 2| which meshes with a gear 22 rotatably mounted on a stub shaft 23 secured to the bearing plate I8 (Fig. 2). When the finger piece la is depressed, the annular operating member 20 is rotated in anti-clockwise direction and thereby the gear 22 likewise is rotated and in turn drives the annular segment 24 which meshes with the gear 22. The

bearing member I9 is provided with an arcuate recess 25 through which the stub shaft 23 including the hub of the gear 22 passes to permit this action just described. A lever 26 which is pivotally secured to the bearing member I9 is adapted to actuate the tensioning lever 21 of the lens shutter, when the finger piece Ia. is depressed, thereby tensioning the shutter. The lever 26 is under the influence of a spring 28. At the same time, a linkage 29, 30 which is connected with the bearing member I9 is actuated and drives by means of a ratchet device 311, 32 a gear 33 which in the present instance is integrally formed with the ratchet wheel 32 (Fig. 3). The gear 33 in turn engages a gear 34 on a shaft 34" having secured thereto another gear 35 (Fig. 15). This v last named gear 35 meshes with a gear 36 which drives the roller I2 and also meshes with a gear' 31 which is coupled with a customary coupling member 31 which drives the film take-up spool I3 (Figs. 3 and 15). The pawl 3| of the ratchet device 3|, 32 is normally urged by a spring-3|,

' intoengagement with the ratchet wheel 32. v

- In order to prevent a return movement of the film advancing mechanism when the annular operating member 20 returns to its initial position,

.a locking pawl 38 is provided which'is urged by a spring, 38' into engagement with the ratchet wheel 32. To insure a complete tensioning of the shutter and a corresponding complete advancement of the film, there is provided a control gearing consisting of a toothed segment 39, a locking pawl 49 and a spring 4|. The toothed segment 39 is arranged on the annular operating member 20 and the locking pawl 40 is always urged by the spring M in such direction that the longitudinal axis of the pawl intersects the center axis of the member 20. Owing to the particular formation of the locking teeth on the toothed segment and the arrangement of the pawl 49, it is impossible to reverse the rotation of the annular operating member 20 until the pawl 40 has been brought out of engagement with the locking teeth 39, which can take place only after the actuation movement or a. return movement has been comation of the control gearing.

A spring 42 returns the annular operating member 20 and therewith the finger piece I a to its initial position. This spring 42 is mounted on a bolt 43, and one end of the same engages the pin 44 on the link 29. It is apparent, that the spring 42 is tensioned when the finger piece la is depressed and that upon release of the finger piece la the spring 42 causes a return movement of the bearing member I9 which by means of the gear 22 is coupled with the annular operating member 20.

The shutter mechanism is released by pushing the button 5, the movement of which is transmitted by the member 41 to the lever 48 which is pivotally mounted at 48. The curved end 59 of the lever 48 engages the upper end of the push rod 5I and pushes the same downward against the action of a spring 52 which surrounds the upper portion of the push rod 5|. An arm 53 is secured by a screw 54-to the push rod 5 I. The end of the screw 54 is cylindrical and projects outwardly from the push rod 5I and into a curved slot 56 (Fig. '7) of abracket 51 which issecured by screws 51' (Figs. 2, 3, '7) to the camera casing, namely to section I. When the push rod 5! moves downwardly, the bent end 59 of the arm 53 actuates the release lever 58 of the shutter and moves in a path corresponding to the path in which the release lever 58 is moved. (Fig. 3).

The safety device for preventing a double exposure of film sections and also the removal of an unexposed film section from its position behind the lens, is particularly illustrated in the Figs. 7 to 12. Fig. 8 shows the safety device in a position in which the shutter has just been released and is now ready to be tensioned again,

whereby according to the foregoing description the exposed film section is advanced toward the take-up spool.

' Fig. 9 shows the safety device in a position in which the shutter has been tensioned and simultaneously therewith the next unexposed film section has been moved into operative position, so that the shutter is ready to be released.

Fig. 10 shows the safety'device in a position in which the release button of the shutter is pressed downwardly and held in this position so that it is possible to unwind the leading end of the film strip, or to take up the rear end of the film strip respectively.

It will be noted from Fig. 8, that a release of the shutter cannot take place, because the nose II of the lever 62, which is rotatable about the shaft 15, is positioned directly under the shoulder I2- of the push rod 5|. The shaft 15 is" fixedly secured to the bracket 51 (Figs. 7, 11, 12).

against the reduced portion 65 of the push rod 5|. 75

It now, for the purpose of tensioning the shutter and advancing the film strip, the finger piece la is pushed downwardly, then the resulting rotation of the annular operating member 20 causes a rotation of the gear 22 which rotates the bearing member I! in clockwise direction (Fig. 3). This bearing member I9 is now provided with a laterally bent stop 6|) which at the end of the aforesaid rotative movement engages a laterally bent portion 5| of the lever 62, and-swings the latter about its pivot until its cam 66 jumps over the nose 61 of pawl 64. From then on the lever 62 continues its movement alone under the action of the bearing member ID. Upon the return movement of the bearing member l8 the nose 68 of the lever 62 jumps over the shoulder Ill and now the parts are in the position as shown in the Fig. 9.

In this position (Fig. 9) a tensioning of the shutter and an advance of the film strip is not possible, because a rotation of the bearing member H! which would cause this action is prevented by the lever 62 whose nose 68 engages the shoulder ID of the member wit. The shutter can now be released, in fact it has to be released before it can be tensioned again. Upon depressing the button 5, the lever 48 pushes the rod 5| down-.

' wardly, and it will be noted that the nose of lever 62 which in Fig. 8 prevents such a downwardmovement is out of the way. The shoulder 12 of the push rod 5| engages the rounded end of the lever 13 and swings the-same downwardly. This lever 13 is yleldingly connected by a spring 14 with the lever 62 and the latter owing to this connection, is moved by the lever 13 anti-clockwise until the cam 68 on lever 62'has been moved past the nose 61 .of the lever 64. From this point on the lever 62 moves alone until its bent portion 6| engages the push rod 5|. When the operator removes his finger from the release button 5, the pushrod 5| is returned by the. spring 52 and the nose ll of the lever 52 comes to rest under the shoulder I2 on the push rod 5|. The parts of the safety device are then again in the position as shownin Fig. 8 in which an actuation of the push rod 5| is prevented until the shutter has been tension'ed again. I Fig. 10 illustrates the position of the push rod 5|, which is obtained by pressing the button 5 downwardly and holding it downwardly. In this position it is possible to wind the leading end of the film strip upon the take-up spool II, or o unwind the rear end of the film strip from t e supply spool l0 by operating the finger piece la. When the finger piece la is depressed all the way downwardly, as has been described in connection with Fig. 8, then the stop 60 engages the bent portion SI of the lever 62 and then causes a movement of this lever.

In order to prevent during this operation that the button 5 is moved-again upwardly by the push rod 5|, the abovementioned yielding connection of lever 62 with the lever 13 by a spring 14 has been provided. When the finger piece la is again pressed downwardly to cause a rotation of the bearing member It], then the lever 62-is again actuated by the stop 60', as already described, andowing to the action of the spring 14 returns to the position illustrated in Fig. 10

.when the bearingmember l9 returns to its initial position. When the winding of the leading end of the film strip or the unwinding of the rear end of the-same has been completed, the button 5 is released, and hereby the safety device between the shutter release mechanism and the shutter.

tensioning and film advancing mechanism is again fully operative to prevent a double exposure or a faulty advancement oi a film strip section, as already described.

What I claim as my invention is 1. In a rollfilm camera, a camero casing provided with an aperture adapted to receive alens system, a shutter with means for tensioning the same, means for conveying the film past said aperture, means for releasing said shutter, and means arranged eoaxially with respect to said aperture and rotatable about the center point of the same for simultaneously operating said shutter tensioning means and said film conveying means, said operating means being provided with a manually operable projection terminating adjacent said shutter release means.

2. In a rollfilm camera, a camera casing provided with an aperture adapted to receive a lens system, a shutter with means for tensioning the same, means for conveying the film past said aperture, and means arrangedcoaxially with respect to said aperture for simultaneously operating said shutter tensioning means and said film conveying means, said operating means including an annular member adapted to be manually rotated in one direction to operate said shutter tensioning means and said film conveying means, and spring means for returning said annular member to initial position after each manual operation.

3. In a rollfilm camera, a camera casing provided with an aperture adapted to receive a lens system, a shutter with means for tensioning the same, means for conveying the film past said tensioning of the shutter and film advancement 3 or a complete return to initial position tively.

4. In a rollfilm camera, a camera casing provided with an aperture adapted to receive a lens system, a shutter with means for tensioning the same, means for conveying the film past said aperture, and means arranged coaxially with respect to said aperture for simultaneously operating said shutter tensioning means and said film conveying means, said operating means including an annular member adapted to be manually rotated in one direction to operate said shutter tensioning means and said film conveying means, spring means for returning said annular member to initial positiomafter each manual operation, and a spring influenced locking pawl cooperating with said annular member for preventing rotation of the same in the other direction as long as its rotation in one direction is insufilcient to cause a complete tensioning of the shutter and a corresponding film advancement or a complete return to initial position respectively. 5. In a rollfilm camera, the combination of shutter release means, a manually operable comyieldingly connected and pivotally supported levers associated with both of said means for per mitting' a second actuation of either of said two means only after the other of said means has been actuated, one of said levers being moved into locking engagement with either one of said two means upon actuation of the respective means while another one of said levers is adapted to be actuated by said shutter release means when the latter is not locked againstactuation by said firstly mentioned lever.

6. In a rollfilm camera, the combination of a shutter release means provided with a manually depressible member, a manually operable combined shutter tensioning and film advancing means, and mechanism including a plurality of yieldingly connected and pivotally supported levers associated with both said first mentioned means for permitting a second actuation of either of said two means only after the other of said means has been actuated, one of said levers being moved into locking engagement with either one of said two first mentioned means upon actuation of the respective means while another one of said levers is adapted to be actuated by said shutter release means when the latter is not locked against actuation by said first mentioned lever, said secondly mentioned lever in the depressed position of said manually depressible member preventing said firstly mentioned lever from locking said combined shutter tensioning andfilm advancing means, so that the latter may be operated to wind-up and unwind the leading levers is adapted to be actuated by said shutter end and rear end of the film respectively.

7. In a rollfilm camera,'the combination of a shutter release means provided with a manually depressible'member, a manually operable conibined fshutter tensioning and film advancing means, mechanism including a plurality of yieldingly connected and pivotally supported levers associated with both said first mentioned means for permitting a second actuation of either of said two means only after the other of said means has been actuated, one of said levers being moved into locking engagement with either one of said two first mentioned means upon actuation of the respective means while another .one of said release means when the latter is not locked against actuation by said firstly mentioned lever, said secondly mentioned lever in the depressed position of said manually depressible member preventing said firstly mentioned lever from locking said combined shutter tensioning and film advancing means, so that the latter may be perated to wind-up and unwind the leading end and rear end of the film respectively, 'andmeans for automatically returning said manually depressible member to initial position after it has been actuated.

- 8. In a rollfilm camera, a camera casing provided with an aperture adapted to receive a lens system, a shutter with means for tensioning the same, means for releasing the shutter, means for conveying the film past said aperture, a manually operable means coaxially arranged with respect to said aperture for simultaneously operating said shutter tensioning means and said film conveying means, and mechanism associated with said shutter release means and said manually operable means for permitting a second actuation of either of said two last mentioned means only after operable means coaxiallly arranged with respect to said aperture for simultaneously operating said shutter tensioning means and said film conveying means, and mechanism associated with said shutter release means and said manually operable means for permitting a second actuation of either of said two last mentioned means only after the other said last mentioned means has been actuated, said manually operable means being provided with an outwardly extending o crating lever terminating adjacent said shutter release means.

10. In a rollfilm camera, a camera casing provided with an aperture adapted to receive a lens system, a shutter with means for tensioning the same, means for releasing the shutter, means for conveying the film past said aperture, a manually operable means for simultaneously operating saidshuttcr tensioning means and said film conveying means, and mechanism associated with said shutter release means and said manually operable means for permitting a second-actuation of either of said two last mentioned means only after the other said means has been actuated, said manually operable means including a rotatably mounted annular member arranged con centrically with'respect to said aperture and hav- 1 ing gear teeth on a portion of its circumference,

a gear rotatably mounted about a fixed axis and meshing with said gear teeth, a second rotatably said shutter, and spring means fdr returning said two annular members to initial pbsition after each manual operation.

11. In a rollfilm camera as set forth in claim 10, including a spring influenced locking pawl pivotally mounted on said second annular member and cooperating with said first mentioned annular member for preventing rotation of the latter in the other direction as long as its rotation in one direction is insuflicient to cause a complete tenmeans to initial position respectively.

HUBERT NERWIN. 

